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update fixtures/packaging/README.md (#14320)

I had some confusion yesterday with this, figured this reads a little better.  Ran these steps locally to verify they work.
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Sunil Pai committed
a7f270c550f072c5eb5064b231e6542329180622
Parent: ed4c4a5
Committed by GitHub <noreply@github.com> on 11/24/2018, 9:40:56 PM